Don't understand why Travis build is failing

The package tests pass on my machine, but the Travis build seems to be failing with some error related to the installation of the matplotlib dependency. I googled it and came up empty. Is there a bug in the Julia environment on Travis, or am I doing something wrong?

Example of a failed build: Travis CI - Test and Deploy Your Code with Confidence

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That made it run, thanks. Now I have to fix the test timing out issue.